Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Earnings Per Share [Line Items]
Stock Repurchased During Period, Shares	4,227,541
Treasury Stock Acquired, Average Cost Per Share	$ 23.79
Payments for Repurchase of Common Stock	$ 101,483	$ 9,240
Share Repurchase Program [Member]
Earnings Per Share [Line Items]
Stock Repurchased During Period, Shares	4,189,858
Stock Repurchase Program, Authorized Amount	$ 162,500		$ 67,500
Payments for Repurchase of Common Stock	$ 99,800
Shares Repurchased Under Stock Compensation Program [Member]
Earnings Per Share [Line Items]
Stock Repurchased During Period, Shares	37,683
Stock Repurchased During Period, Value	$ 900